The reason you filter your crystals is because the solvent carries away the soluble impurities. If you vac off the solvent, you won't have accomplished anything at all.
If you do know of something that your crystals are soluble in, you could filter through celite, then redissolve your crystals after the impurities have been removed. With repeated rounds of recrystallization as the impurities decrease, you might start to get crystals which are large enough to filter with standard paper. Alternatively, if you have access to a centrifuge, you can always spin them down and decant.